Google Lighthouse
Lighthouse is an open-source, automated tool for improving the performance, quality, and correctness of your web apps.
15,547 users
Yandex Search
Adds Yandex for search engines
15,302 users
Text Link
Allows URI texts written in webpages to be loaded by double clicks.
14,861 users
Lightning Autofill
The most popular autofill extension, boosting productivity since 2010.
13,780 users
RESTED
A REST client for the rest of us
13,603 users
JavaScript Toggle On and Off (WebExtension)
Toggle JavaScript engine on and off the easy way
12,511 users
My IP Hider VPN
My IP Hider VPN is number one tool for hiding your IP and unblocking any web site! If your Firefox version is less then 55 please install older My IP Hider VPN from "Version History" (https://goo.gl/7ZQQjZ)
12,466 users
javascript
add javascript that will run on this domain. back up your scripts in the options area (shortcut there by clicking the "JS" letters in the bottom right)
12,400 users
Chrome Mask
Makes Firefox wear a mask to look like Chrome to websites that block Firefox otherwise.
12,314 users
JSON Lite
Fast JSON viewer - highlights, shows items count/size, handles large files
11,982 users
Flag Cookies
A cookie and browser storage data manager on steroids to mark, 'flag', and manage cookies using rulesets.
11,909 users
Fake Filler
A form filler that fills all form inputs (textboxes, textareas, radio buttons, dropdowns, etc.) with fake and randomly generated data. The purpose of this extension is to help developers and testers test forms quickly and easily.
11,688 users
Export Cookies
Export cookies to a Netscape format cookies.txt file.
11,667 users
Allow CORS: Access-Control-Allow-Origin
Easily add (Access-Control-Allow-Origin: *) rule to the response header.
11,363 users
Header Editor
Manage browser's requests, include modify the request headers and response headers, redirect requests, cancel requests
11,220 users
Fonts Ninja
Speed up your design workflow!
10,973 users
Modify Header Value
Add, modify or remove a header for any request on desired domains.
10,911 users
IP Address and Domain Information
The Ultimate online investigation tool! See detailed information about every IP Address, Domain Name and Provider.
10,870 users
Mobile emulator
Smartphone emulator on computer very realistic with several models to test mobile websites.
10,790 users
Empty Cache Button
Cache clearing made easy. One click.
10,721 users
RESTer
A REST client for almost any web service.
10,290 users
ScriptCat
脚本猫,一个可以执行用户脚本的浏览器扩展,万物皆可脚本化,让你的浏览器可以做更多的事情!
9,904 users
Proxy Toggle
Toggle between direct connection and a single proxy server via a toolbar icon.
9,834 users
Angular DevTools
Angular DevTools extends Firefox DevTools adding Angular specific debugging and profiling capabilities.
9,400 users
Refined GitHub
Simplifies the GitHub interface and adds many useful features.
9,061 users